handle_events8.js

来自「《JavaScript精粹》 源文件下载」· JavaScript 代码 · 共 117 行

addLoadListener(initEvents);

function initEvents()
{
  var mylink = document.getElementById("mylink");

  attachEventListener(mylink, "click", engage, false);
  
  return true;
}

function engage()
{
  var href = this.getAttribute("href");

  alert("Engage: " + href);
  
  return true;
}

function attachEventListener(target, eventType, functionRef, capture)
{
  if (typeof target.addEventListener != "undefined")
  {
    target.addEventListener(eventType, functionRef, capture);
  }
  else if (typeof target.attachEvent != "undefined")
  {
    var functionString = eventType + functionRef;
    target["e" + functionString] = functionRef;
    
    target[functionString] = function(event)
    {
      if(typeof event == "undefined"){event = window.event}; target["e" + functionString](event);
    };
    
    target.attachEvent("on" + eventType, target[functionString]);
  }
  else
  {
    eventType = "on" + eventType;

    if (typeof target[eventType] == "function")
    {
      var oldListener = target[eventType];

      target[eventType] = function()
      {
        oldListener();

        return functionRef();
      }
    }
    else
    {
      target[eventType] = functionRef;
    }
  }

  return true;
}

function detachEventListener(target, eventType, functionRef, capture)
{
  if (typeof target.removeEventListener != "undefined")
  {
    target.removeEventListener(eventType, functionRef, capture)
  }
  else if (typeof target.detachEvent != "undefined")
  {
    var functionString = eventType + functionRef;

    target.detachEvent("on" + eventType, target[functionString]);

    target["e" + functionString] = null;
    target[functionString] = null;
  }
  else
  {
    target["on" + eventType] = null;
  }

  return true;
}

function addLoadListener(fn)
{
  if (typeof window.addEventListener != 'undefined')
  {
    window.addEventListener('load', fn, false);
  }
  else if (typeof document.addEventListener != 'undefined')
  {
    document.addEventListener('load', fn, false);
  }
  else if (typeof window.attachEvent != 'undefined')
  {
    window.attachEvent('onload', fn);
  }
  else
  {
    var oldfn = window.onload;
    if (typeof window.onload != 'function')
    {
      window.onload = fn;
    }
    else
    {
      window.onload = function()
      {
        oldfn();
        fn();
      };
    }
  }
}